Sadly enough, the international community is really good at infighting and wasting money, and really bad at coming up with a followup for the ISS :( So China, for all its flaws, will have the biggest functioning space station in LEO at some point. ISS operations have just been extended to 2034, but if we get a single micrometeorite hit in the wrong spot (e.g. Node 2), that’ll put an end to it.